OK, let's crack this. We're given 520 and our task is to multiply it by 41. Essentially, we'll be adding 520 to itself 41 times.
Step 1: 0 + 520 = 520
Step 2: 520 + 520 = 1040
Step 3: 1040 + 520 = 1560
Step 4: 1560 + 520 = 2080
Step 5: 2080 + 520 = 2600
Step 6: 2600 + 520 = 3120
Step 7: 3120 + 520 = 3640
Step 8: 3640 + 520 = 4160
Step 9: 4160 + 520 = 4680
Step 10: 4680 + 520 = 5200
Step 11: 5200 + 520 = 5720
Step 12: 5720 + 520 = 6240
Step 13: 6240 + 520 = 6760
Step 14: 6760 + 520 = 7280
Step 15: 7280 + 520 = 7800
Step 16: 7800 + 520 = 8320
Step 17: 8320 + 520 = 8840
Step 18: 8840 + 520 = 9360
Step 19: 9360 + 520 = 9880
Step 20: 9880 + 520 = 10400
Step 21: 10400 + 520 = 10920
Step 22: 10920 + 520 = 11440
Step 23: 11440 + 520 = 11960
Step 24: 11960 + 520 = 12480
Step 25: 12480 + 520 = 13000
Step 26: 13000 + 520 = 13520
Step 27: 13520 + 520 = 14040
Step 28: 14040 + 520 = 14560
Step 29: 14560 + 520 = 15080
Step 30: 15080 + 520 = 15600
Step 31: 15600 + 520 = 16120
Step 32: 16120 + 520 = 16640
Step 33: 16640 + 520 = 17160
Step 34: 17160 + 520 = 17680
Step 35: 17680 + 520 = 18200
Step 36: 18200 + 520 = 18720
Step 37: 18720 + 520 = 19240
Step 38: 19240 + 520 = 19760
Step 39: 19760 + 520 = 20280
Step 40: 20280 + 520 = 20800
Step 41: 20800 + 520 = 21320

So, 520*41 = 21320